Leer roll



May 20, 1930.

w. F; BROWN 1,759,220

` LEER ROLL Filed Oct. ll 1925 "'ATTURNEY Patented May 20, 1930 UNITEDSTATES PATNT OFFCE WILB'UR F. BROWN, OF TOLEDO, OHIO, ASSIGNOR TOLIBBEY-OWENS GLASS COMPANY, OF TOLEDO, OHIO, A CORPORATION OF OHIO LEERROLL Application led October 1, 1925.

The present invention relates to sheet glass apparatus, and hasparticular reference to an improved type of annealing leerl andespecially the rolls used therein.

YAn important object of the invention is to provide an annealingleerroll formed from a material which will not injure a sheet of heatedglasseven if there is relative move,- ment between the glass and theroll.

Another object of the invention is to provide an annealing leercomprising a plurality of rolls formed from a non-corrosiveheatresistingalloy which will vnot injure the glass being annealed in any manner.

Still another object is to provide a leer roll of this nature formedfrom a non-corrosive inetal which is preferably made of one of thesofter non-corrosive metals or alloys, thus lpermitting relativemovement between the glass and the roll without injury to the surface ofthe glass.

Other objects and advantages of the invention will become apparentduring the course of the following description.

`In the drawings wherein like numerals are employed to designate likeparts throughout the same,

Fig. l is a fragmentary vertical longitudinal section through one typeof glass apparatus,

Fig. 2 is a fragmentary top plan View showing one forni of leer rollswhich may be used,

Fig. 3 is a longitudinal cross-section through a roll,

Fig. 4 is a transverse cross-section thereof, Fig. 5 is a sectional viewof still another form.

Sheet glass is produced in a number of ways, such as by drawing acylinder', splitting the cylinder und iattening the same into sheetform, continuously drawing a sheet from a pool of molten glass anddefiecting it over a bending roll and passing it through a horizontalannealing leer, and drawing a sheet through a lslotted member known as.a dc'puter, and passing the sheet through a vertical annealing leer,and many other methods. Une type of machine is disclosed in thedrawings. Fig. l being the Colburn Serial No. 59,758.

machine. This machine is provided with an annealing` leer through whichthe glass .sheet hein(r drawn passes, entering one end in a heated stateand passingoutof the other end in a relatively cool state.'

The'leer comprises a housing in which are mounted a plurality ofrotatable rolls Which support ,and convey the sheet through the leer.These so-called leer rolls are customarily formed from an asbestoscomposition which is not lentirely smooth and on which va high polishcannot be formed. 'The glass entering the leer is comparatively soft andsusceptible to surface injury if it contacts with anything but a smoothsurface. v It is almost impossible to regulate the speed of rotation ofthe leer rolls to give a peripheral speed the same as the speed of thesheet moving over the rolls as the sheet does not inove at the samespeed throughout its entire length due to expansions and contractions inthe sheet during the various stages of annealing. Because of thisdili'erence in the relative speeds of the roll and the sheet, relativemovement occurs betweenv the two which frequent-ly causes the asbestosroll to scratch the soft sheet.

To overcome the dilhculties and objections offered by the asbestos leerrolls, I provide a roll adapted for use in the sheet glass annealingleer which will permit relative movement between the sheet and the rollwithout any damage. It will be understood that-by relative n'ioveinent lmean only the small slippage between glass sheet and leer rolls whichoccurs because it is mechanically impractical to equalize perfectly theperipheral speed of all leer rolls with the speed of glass sheet. Toproduce a roll having a highly polished surface it is desirable to use ametal roll. I have found that a nickel surfaced roll will function withexcellent results when used asa leer roll.

Monel is another metal which is good for thisl purpose and whichproduces a roll capable of having a highly polishedv surface which willnot corrode when subjected to the action of the heat in the annealing'leer.

In addition to those metals which are relatively soft, the rolls canalso he formed from a non-corrosive metal somewhat harder, this groupincluding nichrome, stellite, and other similar metals. As examples ofmetals which practice has shown will not work, I may name copper, whichscales in service, and cast iron which scales and causes bad scratcheson the glass sheet.

In the drawings, in Fig. 1, is shown an fannealing' leer used inconjunction with the type of leer rolls were formed from an as-v bestosor'similar composition which frequently made characteristic leer rollscratches on the contacting side of the glass sheet,

particularly in the hot end of the leer. Such scratches are especiallynoticeable and objectionable when the sheet glass 1s silvered.

In Fig. 2 is shown a type of construction which can be satisfactorily.used, andl discloses the rolls 1'9 comprising a pluralityl of sections21 whereby the rolls can be more easily handled and more cheaplymanufactured.- The joints 22 between the rolls are preferably staggeredas indicated toA revent the formation of lines or other sur ace defectsin -the sheet passing. over theprlls. The

leer rolls externally of the leer 17 carry suitable gears 23 which maybe' associated with any source of power to rotate the said rolls. Therolls may be formed from the relatively soft metal in many ways, and asshown in Figs. 3 and 4 comprise a shaft24 v on which isa cylinder 25formedifrom the desired metal. yThe cylinder 25 is considered as a solidroll, and is formed entirely from the metal used. It is retained fromthe shaft4 24 andguarded against accidental displacement by means of acollar 26 and a set-screw 27. The roll 25' is smoothed off and given ahigh polish to present a good surface which will not injme the sheetwhen contacting therewith.

In Fig. 5 shown a modification wherein the shaft 29 carries a core 29 ofa relatively cheap form of metal over which is arranged a skin or thinshell 30 of the noneorrosive metal. Relative movement between the shell30 and the core 29 may be prevented by countersinking set-screws 31 asillustrated.

Instead of the single rows of rolls 19 in Fig. l, sets or pairs of rolls43 are used inthe Fourcault machine, These rolls, like the other rollsin the past, have been formed from an asbestos or similar composition,and due tember, 1925.

to the pressure-of the rolls against sheet considerable damage has been`donewto theI 1 By forming the rolls v By constrctingthe rolls -aov f nosurface damage is done to the sheet being .ni

core 29, and in view 'of this' fact'the Shell i can be made as thinaspossilile consistent with good mechanical design.Y (if course therolls can be made. iny single lengths instead of the sections as shownin' Fig. 2, but either forni will work satisfactorily,und ivill givemuch better results ythanjtlie old `type of asbestos rolls. v y

It is to be understood thatthe form of the invention herewith shown.vand described isA to be taken as the preferred enlbodiment of thesaine, and that various changes in the shape, size and arrangement oflparte may be resorted to withoilt departing vf"o1n the spirit of theinvention outhe scope of the subjoined claims. f

Claims; i

1. In an annealing leer for. use in sheet glass apparatus, apluralityjof sectional rolls,

the joints of the sections of thev roll being .staggered with relationto the adjacent rolls. Y 2. In an annealing .leer for Ause in sheetglass apparatus, -a plurality of sectional rolls, the ljoints of thesections being stageredwith relation -to the joints ofthe ladjacentrolls, said sections being formed from a non-corrosive metal.

3. In an annealing leer for use in sheet glass apparatus, a plurality ofsectional rolls, the joints of' the sections being staggered'y withrelation to the joints of adjacent rolls, j

said sections beingiorined from a relativen ly soft metal. l

Signed at Toledo, in ,the county of Lucas, and State of Ol1io,.this 28thday of Sepwiminn. F. BmiwN.

